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-electron valence instability inZhai, Hui-Fei; Tang, Zhang-Tu; Jiang, Hao; Xu, Kai; Zhang, Ke; Zhang, Pan; Bao, Jin-Ke; Sun, Yun-Lei; Jiao, Wen-He; Nowik, I.; Felner, I.; Li, Yu-Ke; Xu, Xiao-Feng; Tao, Qian; Feng, Chun-Mu; Xu, Zhu-An; Cao, Guang-Han · Physical Review B · 2014